Just for laughs I googled around and found this. The Yankee Stadium site would be ideal. Aqueduct? No so much. As you can see the A train has a stop there and it's right off the Belt Parkway, but in all honesty I'm not sure if either is equipped to handle the load of a 20K+ crowd. Perhaps someone more familiar with the area can chime in.
From a strictly personal point of view, this site wouldn't be a deal breaker for me at all. I did a quick search on the MTA web page and it would be about 4 stops more for me on the subway to get there as compared to Yankee Stadium. A bit further than the Bronx, but actually a lost closer than Flushing Meadows Park.
Honestly, I still think we end up in the Bronx. Look how things have progressed. All of a sudden the Mayor seems on board for the Bronx location and the factory is balking when for the longest time it seemed to be the opposite. I'm getting the feeling once the checkbok opens up a little more for the factory people we'll have a done deal.